Answers

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The size scaling is defined by the number of communication signals that are allowed in the system. Signals are purchased in packages. Packages are available for 50, 500, and 2500 signals.

The server and clients are scaled based on signals. A Signal is any aspect object of the type PLC xx Signal Type, where xx defines the type of signal. Each signal represents a value that is read or written from or to a controller, PLC or other external device connected to Compact HMI 800.

BTW Tag is device/measurement/valve/motor/etc. (can we say KKS?)....

More info you can find in Compact HMI product catalogue (if the link is posted wrong, copy / paste it directly into browser):

There are also data regarding Compact HMI limits (10k database, number of stations, etc.).

OPC is similar - all "incomming" signals via OPC interface which are used in control strategies or historian are counted as signal. I am not only sure how it is going on with signals which are not used in control strategies / historian - they are only visualized on operator screens via any graphics (maybe there is not necessary any license?).

Sorry for providing wrong info from my side. vijayaram is right. In fact the Compact HMI license engine counts tags, which is in fact the number of faceplates in the control structure.Signal to tag ration is 1:2.5, means that if you purchase a 1000 signal license, the license engine would allow for 400 faceplates in the control structure. Tag definition/clarification is explain in the next thread:

I'm not sure. From Table 6 in 3BSE041037-510_B_en_Compact_HMI_800_5.1_Product_Guide.pdf CHMI Server Workplace is licensed by number of signals (50, 500, 2500). I think, that number of tags is additional clarification - you can't have number of tags (object with at least one faceplate) more than 20, 200, 1000 with number of signals 50, 500, 2500.

Tags are also pointed in teh same document, but for additional/extended licenses. I clarified this topic via internal ABB channles and previously posted comment represents official answer. I also pointed to our people that there will be nice to have clear info in this document regarding licensing. They told me try to fix it in the next version of this document....